[quote=Wine Woman]The book says it's a Bias Gauge. It says, "The bias gauge may be used by placing it on the point of a pair of scissors and different widths of material may be cut by adjusting the slide marked "S". Bias binding for binder No. 36595 should be cut fifteen-sixteenths of an inch wide, and to do this the slide "S" should be placed half way between the lines marked "F" and "B" and the edge of the goods should be passed through the attachment and against the slide while cutting. Hope this helps!
Thank you so much. Learn something new each day. Ruth